*{
    margin: 0;
    padding: 0;
    
}

.warrper{
    width: 100%;
    height: 100vh;
    overflow: hidden;
}
.box{
    position: relative;
    transition: all 3s;
    top:0;
}
.item{
    width: 100%;
    height: 100vh;
    background: url('img/1.png') no-repeat;
    background-size: 100% 100%;
    position: relative;
    margin-bottom: 10px;
    }
.item p {
   color: red;
   font-size: 30px;
   position: absolute;
   opacity: 0;
}
.item p.t{
    top:100px;
    left: 50%;
}
.item p.b{
    bottom: 100px;
    left: 50%;
}
.item p.l{
    left: 100px;
    top: 50%;
}
.item p.r{
    right: 100px;
    top:50%;
}
.item span{
    position: absolute;
    left: 100px;
    width: 100px;
    height: 100px;
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    font-size: 50px;
    line-height: 100px;
    text-align: center;
    cursor: pointer;
}
.item span.top{
    top: 100px;
}
.item span.bottom{
    bottom: 100px;
}
